[PATCH v5 01/26] ethdev: introduce generic flow API

[Adrien Mazarguil <adrien.mazarguil@6wind.com>]

This new API supersedes all the legacy filter types described in
rte_eth_ctrl.h. It is slightly higher level and as a result relies more on
PMDs to process and validate flow rules.

Benefits:

- A unified API is easier to program for, applications do not have to be
  written for a specific filter type which may or may not be supported by
  the underlying device.

- The behavior of a flow rule is the same regardless of the underlying
  device, applications do not need to be aware of hardware quirks.

- Extensible by design, API/ABI breakage should rarely occur if at all.

- Documentation is self-standing, no need to look up elsewhere.

Existing filter types will be deprecated and removed in the near future.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Olga Shern <olgas@mellanox.com>
---
 MAINTAINERS                            |   4 +
 doc/api/doxy-api-index.md              |   2 +
 lib/librte_ether/Makefile              |   3 +
 lib/librte_ether/rte_eth_ctrl.h        |   1 +
 lib/librte_ether/rte_ether_version.map |  11 +
 lib/librte_ether/rte_flow.c            | 159 +++++
 lib/librte_ether/rte_flow.h            | 947 ++++++++++++++++++++++++++++
 lib/librte_ether/rte_flow_driver.h     | 182 ++++++
 8 files changed, 1309 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 3bb0b99..775b058 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -243,6 +243,10 @@ M: Thomas Monjalon <thomas.monjalon@6wind.com>
 F: lib/librte_ether/
 F: scripts/test-null.sh
 
+Generic flow API
+M: Adrien Mazarguil <adrien.mazarguil@6wind.com>
+F: lib/librte_ether/rte_flow*
+
 Crypto API
 M: Declan Doherty <declan.doherty@intel.com>
 F: lib/librte_cryptodev/
diff --git a/doc/api/doxy-api-index.md b/doc/api/doxy-api-index.md
index de65b4c..4951552 100644
--- a/doc/api/doxy-api-index.md
+++ b/doc/api/doxy-api-index.md
@@ -39,6 +39,8 @@ There are many libraries, so their headers may be grouped by topics:
   [dev]                (@ref rte_dev.h),
   [ethdev]             (@ref rte_ethdev.h),
   [ethctrl]            (@ref rte_eth_ctrl.h),
+  [rte_flow]           (@ref rte_flow.h),
+  [rte_flow_driver]    (@ref rte_flow_driver.h),
   [cryptodev]          (@ref rte_cryptodev.h),
   [devargs]            (@ref rte_devargs.h),
   [bond]               (@ref rte_eth_bond.h),
diff --git a/lib/librte_ether/Makefile b/lib/librte_ether/Makefile
index efe1e5f..9335361 100644
--- a/lib/librte_ether/Makefile
+++ b/lib/librte_ether/Makefile
@@ -44,6 +44,7 @@ EXPORT_MAP := rte_ether_version.map
 LIBABIVER := 5
 
 SRCS-y += rte_ethdev.c
+SRCS-y += rte_flow.c
 
 #
 # Export include files
@@ -51,6 +52,8 @@ SRCS-y += rte_ethdev.c
 SYMLINK-y-include += rte_ethdev.h
 SYMLINK-y-include += rte_eth_ctrl.h
 SYMLINK-y-include += rte_dev_info.h
+SYMLINK-y-include += rte_flow.h
+SYMLINK-y-include += rte_flow_driver.h
 
 # this lib depends upon:
 DEPDIRS-y += lib/librte_net lib/librte_eal lib/librte_mempool lib/librte_ring lib/librte_mbuf
diff --git a/lib/librte_ether/rte_eth_ctrl.h b/lib/librte_ether/rte_eth_ctrl.h
index fe80eb0..8386904 100644
--- a/lib/librte_ether/rte_eth_ctrl.h
+++ b/lib/librte_ether/rte_eth_ctrl.h
@@ -99,6 +99,7 @@ enum rte_filter_type {
 	RTE_ETH_FILTER_FDIR,
 	RTE_ETH_FILTER_HASH,
 	RTE_ETH_FILTER_L2_TUNNEL,
+	RTE_ETH_FILTER_GENERIC,
 	RTE_ETH_FILTER_MAX
 };
 
diff --git a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
index 72be66d..384cdee 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -147,3 +147,14 @@ DPDK_16.11 {
 	rte_eth_dev_pci_remove;
 
 } DPDK_16.07;
+
+DPDK_17.02 {
+	global:
+
+	rte_flow_validate;
+	rte_flow_create;
+	rte_flow_destroy;
+	rte_flow_flush;
+	rte_flow_query;
+
+} DPDK_16.11;
diff --git a/lib/librte_ether/rte_flow.c b/lib/librte_ether/rte_flow.c
new file mode 100644
index 0000000..d98fb1b
--- /dev/null
+++ b/lib/librte_ether/rte_flow.c
@@ -0,0 +1,159 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2016 6WIND S.A.
+ *   Copyright 2016 Mellanox.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of 6WIND S.A. nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+
+#include <rte_errno.h>
+#include <rte_branch_prediction.h>
+#include "rte_ethdev.h"
+#include "rte_flow_driver.h"
+#include "rte_flow.h"
+
+/* Get generic flow operations structure from a port. */
+const struct rte_flow_ops *
+rte_flow_ops_get(uint8_t port_id, struct rte_flow_error *error)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
+	const struct rte_flow_ops *ops;
+	int code;
+
+	if (unlikely(!rte_eth_dev_is_valid_port(port_id)))
+		code = ENODEV;
+	else if (unlikely(!dev->dev_ops->filter_ctrl ||
+			  dev->dev_ops->filter_ctrl(dev,
+						    RTE_ETH_FILTER_GENERIC,
+						    RTE_ETH_FILTER_GET,
+						    &ops) ||
+			  !ops))
+		code = ENOSYS;
+	else
+		return ops;
+	rte_flow_error_set(error, code, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
+			   NULL, rte_strerror(code));
+	return NULL;
+}
+
+/* Check whether a flow rule can be created on a given port. */
+int
+rte_flow_validate(uint8_t port_id,
+		  const struct rte_flow_attr *attr,
+		  const struct rte_flow_item pattern[],
+		  const struct rte_flow_action actions[],
+		  struct rte_flow_error *error)
+{
+	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);
+	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
+
+	if (unlikely(!ops))
+		return -rte_errno;
+	if (likely(!!ops->validate))
+		return ops->validate(dev, attr, pattern, actions, error);
+	rte_flow_error_set(error, ENOSYS, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
+			   NULL, rte_strerror(ENOSYS));
+	return -rte_errno;
+}
+
+/* Create a flow rule on a given port. */
+struct rte_flow *
+rte_flow_create(uint8_t port_id,
+		const struct rte_flow_attr *attr,
+		const struct rte_flow_item pattern[],
+		const struct rte_flow_action actions[],
+		struct rte_flow_error *error)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
+	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);
+
+	if (unlikely(!ops))
+		return NULL;
+	if (likely(!!ops->create))
+		return ops->create(dev, attr, pattern, actions, error);
+	rte_flow_error_set(error, ENOSYS, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
+			   NULL, rte_strerror(ENOSYS));
+	return NULL;
+}
+
+/* Destroy a flow rule on a given port. */
+int
+rte_flow_destroy(uint8_t port_id,
+		 struct rte_flow *flow,
+		 struct rte_flow_error *error)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
+	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);
+
+	if (unlikely(!ops))
+		return -rte_errno;
+	if (likely(!!ops->destroy))
+		return ops->destroy(dev, flow, error);
+	rte_flow_error_set(error, ENOSYS, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
+			   NULL, rte_strerror(ENOSYS));
+	return -rte_errno;
+}
+
+/* Destroy all flow rules associated with a port. */
+int
+rte_flow_flush(uint8_t port_id,
+	       struct rte_flow_error *error)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
+	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);
+
+	if (unlikely(!ops))
+		return -rte_errno;
+	if (likely(!!ops->flush))
+		return ops->flush(dev, error);
+	rte_flow_error_set(error, ENOSYS, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
+			   NULL, rte_strerror(ENOSYS));
+	return -rte_errno;
+}
+
+/* Query an existing flow rule. */
+int
+rte_flow_query(uint8_t port_id,
+	       struct rte_flow *flow,
+	       enum rte_flow_action_type action,
+	       void *data,
+	       struct rte_flow_error *error)
+{
+	struct rte_eth_dev *dev = &rte_eth_devices[port_id];
+	const struct rte_flow_ops *ops = rte_flow_ops_get(port_id, error);
+
+	if (!ops)
+		return -rte_errno;
+	if (likely(!!ops->query))
+		return ops->query(dev, flow, action, data, error);
+	rte_flow_error_set(error, ENOSYS, RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
+			   NULL, rte_strerror(ENOSYS));
+	return -rte_errno;
+}
diff --git a/lib/librte_ether/rte_flow.h b/lib/librte_ether/rte_flow.h
new file mode 100644
index 0000000..98084ac
--- /dev/null
+++ b/lib/librte_ether/rte_flow.h
@@ -0,0 +1,947 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2016 6WIND S.A.
+ *   Copyright 2016 Mellanox.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of 6WIND S.A. nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RTE_FLOW_H_
+#define RTE_FLOW_H_
+
+/**
+ * @file
+ * RTE generic flow API
+ *
+ * This interface provides the ability to program packet matching and
+ * associated actions in hardware through flow rules.
+ */
+
+#include <rte_arp.h>
+#include <rte_ether.h>
+#include <rte_icmp.h>
+#include <rte_ip.h>
+#include <rte_sctp.h>
+#include <rte_tcp.h>
+#include <rte_udp.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Flow rule attributes.
+ *
+ * Priorities are set on two levels: per group and per rule within groups.
+ *
+ * Lower values denote higher priority, the highest priority for both levels
+ * is 0, so that a rule with priority 0 in group 8 is always matched after a
+ * rule with priority 8 in group 0.
+ *
+ * Although optional, applications are encouraged to group similar rules as
+ * much as possible to fully take advantage of hardware capabilities
+ * (e.g. optimized matching) and work around limitations (e.g. a single
+ * pattern type possibly allowed in a given group).
+ *
+ * Group and priority levels are arbitrary and up to the application, they
+ * do not need to be contiguous nor start from 0, however the maximum number
+ * varies between devices and may be affected by existing flow rules.
+ *
+ * If a packet is matched by several rules of a given group for a given
+ * priority level, the outcome is undefined. It can take any path, may be
+ * duplicated or even cause unrecoverable errors.
+ *
+ * Note that support for more than a single group and priority level is not
+ * guaranteed.
+ *
+ * Flow rules can apply to inbound and/or outbound traffic (ingress/egress).
+ *
+ * Several pattern items and actions are valid and can be used in both
+ * directions. Those valid for only one direction are described as such.
+ *
+ * At least one direction must be specified.
+ *
+ * Specifying both directions at once for a given rule is not recommended
+ * but may be valid in a few cases (e.g. shared counter).
+ */
+struct rte_flow_attr {
+	uint32_t group; /**< Priority group. */
+	uint32_t priority; /**< Priority level within group. */
+	uint32_t ingress:1; /**< Rule applies to ingress traffic. */
+	uint32_t egress:1; /**< Rule applies to egress traffic. */
+	uint32_t reserved:30; /**< Reserved, must be zero. */
+};
+
+/**
+ * Matching pattern item types.
+ *
+ * Pattern items fall in two categories:
+ *
+ * - Matching protocol headers and packet data (ANY, RAW, ETH, VLAN, IPV4,
+ *   IPV6, ICMP, UDP, TCP, SCTP, VXLAN and so on), usually associated with a
+ *   specification structure. These must be stacked in the same order as the
+ *   protocol layers to match, starting from the lowest.
+ *
+ * - Matching meta-data or affecting pattern processing (END, VOID, INVERT,
+ *   PF, VF, PORT and so on), often without a specification structure. Since
+ *   they do not match packet contents, these can be specified anywhere
+ *   within item lists without affecting others.
+ *
+ * See the description of individual types for more information. Those
+ * marked with [META] fall into the second category.
+ */
+enum rte_flow_item_type {
+	/**
+	 * [META]
+	 *
+	 * End marker for item lists. Prevents further processing of items,
+	 * thereby ending the pattern.
+	 *
+	 * No associated specification structure.
+	 */
+	RTE_FLOW_ITEM_TYPE_END,
+
+	/**
+	 * [META]
+	 *
+	 * Used as a placeholder for convenience. It is ignored and simply
+	 * discarded by PMDs.
+	 *
+	 * No associated specification structure.
+	 */
+	RTE_FLOW_ITEM_TYPE_VOID,
+
+	/**
+	 * [META]
+	 *
+	 * Inverted matching, i.e. process packets that do not match the
+	 * pattern.
+	 *
+	 * No associated specification structure.
+	 */
+	RTE_FLOW_ITEM_TYPE_INVERT,
+
+	/**
+	 * Matches any protocol in place of the current layer, a single ANY
+	 * may also stand for several protocol layers.
+	 *
+	 * See struct rte_flow_item_any.
+	 */
+	RTE_FLOW_ITEM_TYPE_ANY,
+
+	/**
+	 * [META]
+	 *
+	 * Matches packets addressed to the physical function of the device.
+	 *
+	 * If the underlying device function differs from the one that would
+	 * normally receive the matched traffic, specifying this item
+	 * prevents it from reaching that device unless the flow rule
+	 * contains a PF action. Packets are not duplicated between device
+	 * instances by default.
+	 *
+	 * No associated specification structure.
+	 */
+	RTE_FLOW_ITEM_TYPE_PF,
+
+	/**
+	 * [META]
+	 *
+	 * Matches packets addressed to a virtual function ID of the device.
+	 *
+	 * If the underlying device function differs from the one that would
+	 * normally receive the matched traffic, specifying this item
+	 * prevents it from reaching that device unless the flow rule
+	 * contains a VF action. Packets are not duplicated between device
+	 * instances by default.
+	 *
+	 * See struct rte_flow_item_vf.
+	 */
+	RTE_FLOW_ITEM_TYPE_VF,
+
+	/**
+	 * [META]
+	 *
+	 * Matches packets coming from the specified physical port of the
+	 * underlying device.
+	 *
+	 * The first PORT item overrides the physical port normally
+	 * associated with the specified DPDK input port (port_id). This
+	 * item can be provided several times to match additional physical
+	 * ports.
+	 *
+	 * See struct rte_flow_item_port.
+	 */
+	RTE_FLOW_ITEM_TYPE_PORT,
+
+	/**
+	 * Matches a byte string of a given length at a given offset.
+	 *
+	 * See struct rte_flow_item_raw.
+	 */
+	RTE_FLOW_ITEM_TYPE_RAW,
+
+	/**
+	 * Matches an Ethernet header.
+	 *
+	 * See struct rte_flow_item_eth.
+	 */
+	RTE_FLOW_ITEM_TYPE_ETH,
+
+	/**
+	 * Matches an 802.1Q/ad VLAN tag.
+	 *
+	 * See struct rte_flow_item_vlan.
+	 */
+	RTE_FLOW_ITEM_TYPE_VLAN,
+
+	/**
+	 * Matches an IPv4 header.
+	 *
+	 * See struct rte_flow_item_ipv4.
+	 */
+	RTE_FLOW_ITEM_TYPE_IPV4,
+
+	/**
+	 * Matches an IPv6 header.
+	 *
+	 * See struct rte_flow_item_ipv6.
+	 */
+	RTE_FLOW_ITEM_TYPE_IPV6,
+
+	/**
+	 * Matches an ICMP header.
+	 *
+	 * See struct rte_flow_item_icmp.
+	 */
+	RTE_FLOW_ITEM_TYPE_ICMP,
+
+	/**
+	 * Matches a UDP header.
+	 *
+	 * See struct rte_flow_item_udp.
+	 */
+	RTE_FLOW_ITEM_TYPE_UDP,
+
+	/**
+	 * Matches a TCP header.
+	 *
+	 * See struct rte_flow_item_tcp.
+	 */
+	RTE_FLOW_ITEM_TYPE_TCP,
+
+	/**
+	 * Matches a SCTP header.
+	 *
+	 * See struct rte_flow_item_sctp.
+	 */
+	RTE_FLOW_ITEM_TYPE_SCTP,
+
+	/**
+	 * Matches a VXLAN header.
+	 *
+	 * See struct rte_flow_item_vxlan.
+	 */
+	RTE_FLOW_ITEM_TYPE_VXLAN,
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_ANY
+ *
+ * Matches any protocol in place of the current layer, a single ANY may also
+ * stand for several protocol layers.
+ *
+ * This is usually specified as the first pattern item when looking for a
+ * protocol anywhere in a packet.
+ *
+ * A zeroed mask stands for any number of layers.
+ */
+struct rte_flow_item_any {
+	uint32_t num; /* Number of layers covered. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_VF
+ *
+ * Matches packets addressed to a virtual function ID of the device.
+ *
+ * If the underlying device function differs from the one that would
+ * normally receive the matched traffic, specifying this item prevents it
+ * from reaching that device unless the flow rule contains a VF
+ * action. Packets are not duplicated between device instances by default.
+ *
+ * - Likely to return an error or never match any traffic if this causes a
+ *   VF device to match traffic addressed to a different VF.
+ * - Can be specified multiple times to match traffic addressed to several
+ *   VF IDs.
+ * - Can be combined with a PF item to match both PF and VF traffic.
+ *
+ * A zeroed mask can be used to match any VF ID.
+ */
+struct rte_flow_item_vf {
+	uint32_t id; /**< Destination VF ID. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_PORT
+ *
+ * Matches packets coming from the specified physical port of the underlying
+ * device.
+ *
+ * The first PORT item overrides the physical port normally associated with
+ * the specified DPDK input port (port_id). This item can be provided
+ * several times to match additional physical ports.
+ *
+ * Note that physical ports are not necessarily tied to DPDK input ports
+ * (port_id) when those are not under DPDK control. Possible values are
+ * specific to each device, they are not necessarily indexed from zero and
+ * may not be contiguous.
+ *
+ * As a device property, the list of allowed values as well as the value
+ * associated with a port_id should be retrieved by other means.
+ *
+ * A zeroed mask can be used to match any port index.
+ */
+struct rte_flow_item_port {
+	uint32_t index; /**< Physical port index. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_RAW
+ *
+ * Matches a byte string of a given length at a given offset.
+ *
+ * Offset is either absolute (using the start of the packet) or relative to
+ * the end of the previous matched item in the stack, in which case negative
+ * values are allowed.
+ *
+ * If search is enabled, offset is used as the starting point. The search
+ * area can be delimited by setting limit to a nonzero value, which is the
+ * maximum number of bytes after offset where the pattern may start.
+ *
+ * Matching a zero-length pattern is allowed, doing so resets the relative
+ * offset for subsequent items.
+ *
+ * This type does not support ranges (struct rte_flow_item.last).
+ */
+struct rte_flow_item_raw {
+	uint32_t relative:1; /**< Look for pattern after the previous item. */
+	uint32_t search:1; /**< Search pattern from offset (see also limit). */
+	uint32_t reserved:30; /**< Reserved, must be set to zero. */
+	int32_t offset; /**< Absolute or relative offset for pattern. */
+	uint16_t limit; /**< Search area limit for start of pattern. */
+	uint16_t length; /**< Pattern length. */
+	uint8_t pattern[]; /**< Byte string to look for. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_ETH
+ *
+ * Matches an Ethernet header.
+ */
+struct rte_flow_item_eth {
+	struct ether_addr dst; /**< Destination MAC. */
+	struct ether_addr src; /**< Source MAC. */
+	uint16_t type; /**< EtherType. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_VLAN
+ *
+ * Matches an 802.1Q/ad VLAN tag.
+ *
+ * This type normally follows either RTE_FLOW_ITEM_TYPE_ETH or
+ * RTE_FLOW_ITEM_TYPE_VLAN.
+ */
+struct rte_flow_item_vlan {
+	uint16_t tpid; /**< Tag protocol identifier. */
+	uint16_t tci; /**< Tag control information. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_IPV4
+ *
+ * Matches an IPv4 header.
+ *
+ * Note: IPv4 options are handled by dedicated pattern items.
+ */
+struct rte_flow_item_ipv4 {
+	struct ipv4_hdr hdr; /**< IPv4 header definition. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_IPV6.
+ *
+ * Matches an IPv6 header.
+ *
+ * Note: IPv6 options are handled by dedicated pattern items.
+ */
+struct rte_flow_item_ipv6 {
+	struct ipv6_hdr hdr; /**< IPv6 header definition. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_ICMP.
+ *
+ * Matches an ICMP header.
+ */
+struct rte_flow_item_icmp {
+	struct icmp_hdr hdr; /**< ICMP header definition. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_UDP.
+ *
+ * Matches a UDP header.
+ */
+struct rte_flow_item_udp {
+	struct udp_hdr hdr; /**< UDP header definition. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_TCP.
+ *
+ * Matches a TCP header.
+ */
+struct rte_flow_item_tcp {
+	struct tcp_hdr hdr; /**< TCP header definition. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_SCTP.
+ *
+ * Matches a SCTP header.
+ */
+struct rte_flow_item_sctp {
+	struct sctp_hdr hdr; /**< SCTP header definition. */
+};
+
+/**
+ * RTE_FLOW_ITEM_TYPE_VXLAN.
+ *
+ * Matches a VXLAN header (RFC 7348).
+ */
+struct rte_flow_item_vxlan {
+	uint8_t flags; /**< Normally 0x08 (I flag). */
+	uint8_t rsvd0[3]; /**< Reserved, normally 0x000000. */
+	uint8_t vni[3]; /**< VXLAN identifier. */
+	uint8_t rsvd1; /**< Reserved, normally 0x00. */
+};
+
+/**
+ * Matching pattern item definition.
+ *
+ * A pattern is formed by stacking items starting from the lowest protocol
+ * layer to match. This stacking restriction does not apply to meta items
+ * which can be placed anywhere in the stack without affecting the meaning
+ * of the resulting pattern.
+ *
+ * Patterns are terminated by END items.
+ *
+ * The spec field should be a valid pointer to a structure of the related
+ * item type. It may be set to NULL in many cases to use default values.
+ *
+ * Optionally, last can point to a structure of the same type to define an
+ * inclusive range. This is mostly supported by integer and address fields,
+ * may cause errors otherwise. Fields that do not support ranges must be set
+ * to 0 or to the same value as the corresponding fields in spec.
+ *
+ * By default all fields present in spec are considered relevant (see note
+ * below). This behavior can be altered by providing a mask structure of the
+ * same type with applicable bits set to one. It can also be used to
+ * partially filter out specific fields (e.g. as an alternate mean to match
+ * ranges of IP addresses).
+ *
+ * Mask is a simple bit-mask applied before interpreting the contents of
+ * spec and last, which may yield unexpected results if not used
+ * carefully. For example, if for an IPv4 address field, spec provides
+ * 10.1.2.3, last provides 10.3.4.5 and mask provides 255.255.0.0, the
+ * effective range becomes 10.1.0.0 to 10.3.255.255.
+ *
+ * Note: the defaults for data-matching items such as IPv4 when mask is not
+ * specified actually depend on the underlying implementation since only
+ * recognized fields can be taken into account.
+ */
+struct rte_flow_item {
+	enum rte_flow_item_type type; /**< Item type. */
+	const void *spec; /**< Pointer to item specification structure. */
+	const void *last; /**< Defines an inclusive range (spec to last). */
+	const void *mask; /**< Bit-mask applied to spec and last. */
+};
+
+/**
+ * Action types.
+ *
+ * Each possible action is represented by a type. Some have associated
+ * configuration structures. Several actions combined in a list can be
+ * affected to a flow rule. That list is not ordered.
+ *
+ * They fall in three categories:
+ *
+ * - Terminating actions (such as QUEUE, DROP, RSS, PF, VF) that prevent
+ *   processing matched packets by subsequent flow rules, unless overridden
+ *   with PASSTHRU.
+ *
+ * - Non terminating actions (PASSTHRU, DUP) that leave matched packets up
+ *   for additional processing by subsequent flow rules.
+ *
+ * - Other non terminating meta actions that do not affect the fate of
+ *   packets (END, VOID, MARK, FLAG, COUNT).
+ *
+ * When several actions are combined in a flow rule, they should all have
+ * different types (e.g. dropping a packet twice is not possible).
+ *
+ * Only the last action of a given type is taken into account. PMDs still
+ * perform error checking on the entire list.
+ *
+ * Note that PASSTHRU is the only action able to override a terminating
+ * rule.
+ */
+enum rte_flow_action_type {
+	/**
+	 * [META]
+	 *
+	 * End marker for action lists. Prevents further processing of
+	 * actions, thereby ending the list.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_END,
+
+	/**
+	 * [META]
+	 *
+	 * Used as a placeholder for convenience. It is ignored and simply
+	 * discarded by PMDs.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_VOID,
+
+	/**
+	 * Leaves packets up for additional processing by subsequent flow
+	 * rules. This is the default when a rule does not contain a
+	 * terminating action, but can be specified to force a rule to
+	 * become non-terminating.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_PASSTHRU,
+
+	/**
+	 * [META]
+	 *
+	 * Attaches a 32 bit value to packets.
+	 *
+	 * See struct rte_flow_action_mark.
+	 */
+	RTE_FLOW_ACTION_TYPE_MARK,
+
+	/**
+	 * [META]
+	 *
+	 * Flag packets. Similar to MARK but only affects ol_flags.
+	 *
+	 * Note: a distinctive flag must be defined for it.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_FLAG,
+
+	/**
+	 * Assigns packets to a given queue index.
+	 *
+	 * See struct rte_flow_action_queue.
+	 */
+	RTE_FLOW_ACTION_TYPE_QUEUE,
+
+	/**
+	 * Drops packets.
+	 *
+	 * PASSTHRU overrides this action if both are specified.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_DROP,
+
+	/**
+	 * [META]
+	 *
+	 * Enables counters for this rule.
+	 *
+	 * These counters can be retrieved and reset through rte_flow_query(),
+	 * see struct rte_flow_query_count.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_COUNT,
+
+	/**
+	 * Duplicates packets to a given queue index.
+	 *
+	 * This is normally combined with QUEUE, however when used alone, it
+	 * is actually similar to QUEUE + PASSTHRU.
+	 *
+	 * See struct rte_flow_action_dup.
+	 */
+	RTE_FLOW_ACTION_TYPE_DUP,
+
+	/**
+	 * Similar to QUEUE, except RSS is additionally performed on packets
+	 * to spread them among several queues according to the provided
+	 * parameters.
+	 *
+	 * See struct rte_flow_action_rss.
+	 */
+	RTE_FLOW_ACTION_TYPE_RSS,
+
+	/**
+	 * Redirects packets to the physical function (PF) of the current
+	 * device.
+	 *
+	 * No associated configuration structure.
+	 */
+	RTE_FLOW_ACTION_TYPE_PF,
+
+	/**
+	 * Redirects packets to the virtual function (VF) of the current
+	 * device with the specified ID.
+	 *
+	 * See struct rte_flow_action_vf.
+	 */
+	RTE_FLOW_ACTION_TYPE_VF,
+};
+
+/**
+ * RTE_FLOW_ACTION_TYPE_MARK
+ *
+ * Attaches a 32 bit value to packets.
+ *
+ * This value is arbitrary and application-defined. For compatibility with
+ * FDIR it is returned in the hash.fdir.hi mbuf field. PKT_RX_FDIR_ID is
+ * also set in ol_flags.
+ */
+struct rte_flow_action_mark {
+	uint32_t id; /**< 32 bit value to return with packets. */
+};
+
+/**
+ * RTE_FLOW_ACTION_TYPE_QUEUE
+ *
+ * Assign packets to a given queue index.
+ *
+ * Terminating by default.
+ */
+struct rte_flow_action_queue {
+	uint16_t index; /**< Queue index to use. */
+};
+
+/**
+ * RTE_FLOW_ACTION_TYPE_COUNT (query)
+ *
+ * Query structure to retrieve and reset flow rule counters.
+ */
+struct rte_flow_query_count {
+	uint32_t reset:1; /**< Reset counters after query [in]. */
+	uint32_t hits_set:1; /**< hits field is set [out]. */
+	uint32_t bytes_set:1; /**< bytes field is set [out]. */
+	uint32_t reserved:29; /**< Reserved, must be zero [in, out]. */
+	uint64_t hits; /**< Number of hits for this rule [out]. */
+	uint64_t bytes; /**< Number of bytes through this rule [out]. */
+};
+
+/**
+ * RTE_FLOW_ACTION_TYPE_DUP
+ *
+ * Duplicates packets to a given queue index.
+ *
+ * This is normally combined with QUEUE, however when used alone, it is
+ * actually similar to QUEUE + PASSTHRU.
+ *
+ * Non-terminating by default.
+ */
+struct rte_flow_action_dup {
+	uint16_t index; /**< Queue index to duplicate packets to. */
+};
+
+/**
+ * RTE_FLOW_ACTION_TYPE_RSS
+ *
+ * Similar to QUEUE, except RSS is additionally performed on packets to
+ * spread them among several queues according to the provided parameters.
+ *
+ * Note: RSS hash result is normally stored in the hash.rss mbuf field,
+ * however it conflicts with the MARK action as they share the same
+ * space. When both actions are specified, the RSS hash is discarded and
+ * PKT_RX_RSS_HASH is not set in ol_flags. MARK has priority. The mbuf
+ * structure should eventually evolve to store both.
+ *
+ * Terminating by default.
+ */
+struct rte_flow_action_rss {
+	const struct rte_eth_rss_conf *rss_conf; /**< RSS parameters. */
+	uint16_t num; /**< Number of entries in queue[]. */
+	uint16_t queue[]; /**< Queues indices to use. */
+};
+
+/**
+ * RTE_FLOW_ACTION_TYPE_VF
+ *
+ * Redirects packets to a virtual function (VF) of the current device.
+ *
+ * Packets matched by a VF pattern item can be redirected to their original
+ * VF ID instead of the specified one. This parameter may not be available
+ * and is not guaranteed to work properly if the VF part is matched by a
+ * prior flow rule or if packets are not addressed to a VF in the first
+ * place.
+ *
+ * Terminating by default.
+ */
+struct rte_flow_action_vf {
+	uint32_t original:1; /**< Use original VF ID if possible. */
+	uint32_t reserved:31; /**< Reserved, must be zero. */
+	uint32_t id; /**< VF ID to redirect packets to. */
+};
+
+/**
+ * Definition of a single action.
+ *
+ * A list of actions is terminated by a END action.
+ *
+ * For simple actions without a configuration structure, conf remains NULL.
+ */
+struct rte_flow_action {
+	enum rte_flow_action_type type; /**< Action type. */
+	const void *conf; /**< Pointer to action configuration structure. */
+};
+
+/**
+ * Opaque type returned after successfully creating a flow.
+ *
+ * This handle can be used to manage and query the related flow (e.g. to
+ * destroy it or retrieve counters).
+ */
+struct rte_flow;
+
+/**
+ * Verbose error types.
+ *
+ * Most of them provide the type of the object referenced by struct
+ * rte_flow_error.cause.
+ */
+enum rte_flow_error_type {
+	RTE_FLOW_ERROR_TYPE_NONE, /**< No error. */
+	RTE_FLOW_ERROR_TYPE_UNSPECIFIED, /**< Cause unspecified. */
+	RTE_FLOW_ERROR_TYPE_HANDLE, /**< Flow rule (handle). */
+	RTE_FLOW_ERROR_TYPE_ATTR_GROUP, /**< Group field. */
+	RTE_FLOW_ERROR_TYPE_ATTR_PRIORITY, /**< Priority field. */
+	RTE_FLOW_ERROR_TYPE_ATTR_INGRESS, /**< Ingress field. */
+	RTE_FLOW_ERROR_TYPE_ATTR_EGRESS, /**< Egress field. */
+	RTE_FLOW_ERROR_TYPE_ATTR, /**< Attributes structure. */
+	RTE_FLOW_ERROR_TYPE_ITEM_NUM, /**< Pattern length. */
+	RTE_FLOW_ERROR_TYPE_ITEM, /**< Specific pattern item. */
+	RTE_FLOW_ERROR_TYPE_ACTION_NUM, /**< Number of actions. */
+	RTE_FLOW_ERROR_TYPE_ACTION, /**< Specific action. */
+};
+
+/**
+ * Verbose error structure definition.
+ *
+ * This object is normally allocated by applications and set by PMDs, the
+ * message points to a constant string which does not need to be freed by
+ * the application, however its pointer can be considered valid only as long
+ * as its associated DPDK port remains configured. Closing the underlying
+ * device or unloading the PMD invalidates it.
+ *
+ * Both cause and message may be NULL regardless of the error type.
+ */
+struct rte_flow_error {
+	enum rte_flow_error_type type; /**< Cause field and error types. */
+	const void *cause; /**< Object responsible for the error. */
+	const char *message; /**< Human-readable error message. */
+};
+
+/**
+ * Check whether a flow rule can be created on a given port.
+ *
+ * While this function has no effect on the target device, the flow rule is
+ * validated against its current configuration state and the returned value
+ * should be considered valid by the caller for that state only.
+ *
+ * The returned value is guaranteed to remain valid only as long as no
+ * successful calls to rte_flow_create() or rte_flow_destroy() are made in
+ * the meantime and no device parameter affecting flow rules in any way are
+ * modified, due to possible collisions or resource limitations (although in
+ * such cases EINVAL should not be returned).
+ *
+ * @param port_id
+ *   Port identifier of Ethernet device.
+ * @param[in] attr
+ *   Flow rule attributes.
+ * @param[in] pattern
+ *   Pattern specification (list terminated by the END pattern item).
+ * @param[in] actions
+ *   Associated actions (list terminated by the END action).
+ * @param[out] error
+ *   Perform verbose error reporting if not NULL. PMDs initialize this
+ *   structure in case of error only.
+ *
+ * @return
+ *   0 if flow rule is valid and can be created. A negative errno value
+ *   otherwise (rte_errno is also set), the following errors are defined:
+ *
+ *   -ENOSYS: underlying device does not support this functionality.
+ *
+ *   -EINVAL: unknown or invalid rule specification.
+ *
+ *   -ENOTSUP: valid but unsupported rule specification (e.g. partial
+ *   bit-masks are unsupported).
+ *
+ *   -EEXIST: collision with an existing rule.
+ *
+ *   -ENOMEM: not enough resources.
+ *
+ *   -EBUSY: action cannot be performed due to busy device resources, may
+ *   succeed if the affected queues or even the entire port are in a stopped
+ *   state (see rte_eth_dev_rx_queue_stop() and rte_eth_dev_stop()).
+ */
+int
+rte_flow_validate(uint8_t port_id,
+		  const struct rte_flow_attr *attr,
+		  const struct rte_flow_item pattern[],
+		  const struct rte_flow_action actions[],
+		  struct rte_flow_error *error);
+
+/**
+ * Create a flow rule on a given port.
+ *
+ * @param port_id
+ *   Port identifier of Ethernet device.
+ * @param[in] attr
+ *   Flow rule attributes.
+ * @param[in] pattern
+ *   Pattern specification (list terminated by the END pattern item).
+ * @param[in] actions
+ *   Associated actions (list terminated by the END action).
+ * @param[out] error
+ *   Perform verbose error reporting if not NULL. PMDs initialize this
+ *   structure in case of error only.
+ *
+ * @return
+ *   A valid handle in case of success, NULL otherwise and rte_errno is set
+ *   to the positive version of one of the error codes defined for
+ *   rte_flow_validate().
+ */
+struct rte_flow *
+rte_flow_create(uint8_t port_id,
+		const struct rte_flow_attr *attr,
+		const struct rte_flow_item pattern[],
+		const struct rte_flow_action actions[],
+		struct rte_flow_error *error);
+
+/**
+ * Destroy a flow rule on a given port.
+ *
+ * Failure to destroy a flow rule handle may occur when other flow rules
+ * depend on it, and destroying it would result in an inconsistent state.
+ *
+ * This function is only guaranteed to succeed if handles are destroyed in
+ * reverse order of their creation.
+ *
+ * @param port_id
+ *   Port identifier of Ethernet device.
+ * @param flow
+ *   Flow rule handle to destroy.
+ * @param[out] error
+ *   Perform verbose error reporting if not NULL. PMDs initialize this
+ *   structure in case of error only.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+rte_flow_destroy(uint8_t port_id,
+		 struct rte_flow *flow,
+		 struct rte_flow_error *error);
+
+/**
+ * Destroy all flow rules associated with a port.
+ *
+ * In the unlikely event of failure, handles are still considered destroyed
+ * and no longer valid but the port must be assumed to be in an inconsistent
+ * state.
+ *
+ * @param port_id
+ *   Port identifier of Ethernet device.
+ * @param[out] error
+ *   Perform verbose error reporting if not NULL. PMDs initialize this
+ *   structure in case of error only.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+rte_flow_flush(uint8_t port_id,
+	       struct rte_flow_error *error);
+
+/**
+ * Query an existing flow rule.
+ *
+ * This function allows retrieving flow-specific data such as counters.
+ * Data is gathered by special actions which must be present in the flow
+ * rule definition.
+ *
+ * \see RTE_FLOW_ACTION_TYPE_COUNT
+ *
+ * @param port_id
+ *   Port identifier of Ethernet device.
+ * @param flow
+ *   Flow rule handle to query.
+ * @param action
+ *   Action type to query.
+ * @param[in, out] data
+ *   Pointer to storage for the associated query data type.
+ * @param[out] error
+ *   Perform verbose error reporting if not NULL. PMDs initialize this
+ *   structure in case of error only.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+rte_flow_query(uint8_t port_id,
+	       struct rte_flow *flow,
+	       enum rte_flow_action_type action,
+	       void *data,
+	       struct rte_flow_error *error);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_FLOW_H_ */
diff --git a/lib/librte_ether/rte_flow_driver.h b/lib/librte_ether/rte_flow_driver.h
new file mode 100644
index 0000000..cc97785
--- /dev/null
+++ b/lib/librte_ether/rte_flow_driver.h
@@ -0,0 +1,182 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2016 6WIND S.A.
+ *   Copyright 2016 Mellanox.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of 6WIND S.A. nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef RTE_FLOW_DRIVER_H_
+#define RTE_FLOW_DRIVER_H_
+
+/**
+ * @file
+ * RTE generic flow API (driver side)
+ *
+ * This file provides implementation helpers for internal use by PMDs, they
+ * are not intended to be exposed to applications and are not subject to ABI
+ * versioning.
+ */
+
+#include <stdint.h>
+
+#include <rte_errno.h>
+#include "rte_ethdev.h"
+#include "rte_flow.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Generic flow operations structure implemented and returned by PMDs.
+ *
+ * To implement this API, PMDs must handle the RTE_ETH_FILTER_GENERIC filter
+ * type in their .filter_ctrl callback function (struct eth_dev_ops) as well
+ * as the RTE_ETH_FILTER_GET filter operation.
+ *
+ * If successful, this operation must result in a pointer to a PMD-specific
+ * struct rte_flow_ops written to the argument address as described below:
+ *
+ * \code
+ *
+ * // PMD filter_ctrl callback
+ *
+ * static const struct rte_flow_ops pmd_flow_ops = { ... };
+ *
+ * switch (filter_type) {
+ * case RTE_ETH_FILTER_GENERIC:
+ *     if (filter_op != RTE_ETH_FILTER_GET)
+ *         return -EINVAL;
+ *     *(const void **)arg = &pmd_flow_ops;
+ *     return 0;
+ * }
+ *
+ * \endcode
+ *
+ * See also rte_flow_ops_get().
+ *
+ * These callback functions are not supposed to be used by applications
+ * directly, which must rely on the API defined in rte_flow.h.
+ *
+ * Public-facing wrapper functions perform a few consistency checks so that
+ * unimplemented (i.e. NULL) callbacks simply return -ENOTSUP. These
+ * callbacks otherwise only differ by their first argument (with port ID
+ * already resolved to a pointer to struct rte_eth_dev).
+ */
+struct rte_flow_ops {
+	/** See rte_flow_validate(). */
+	int (*validate)
+		(struct rte_eth_dev *,
+		 const struct rte_flow_attr *,
+		 const struct rte_flow_item [],
+		 const struct rte_flow_action [],
+		 struct rte_flow_error *);
+	/** See rte_flow_create(). */
+	struct rte_flow *(*create)
+		(struct rte_eth_dev *,
+		 const struct rte_flow_attr *,
+		 const struct rte_flow_item [],
+		 const struct rte_flow_action [],
+		 struct rte_flow_error *);
+	/** See rte_flow_destroy(). */
+	int (*destroy)
+		(struct rte_eth_dev *,
+		 struct rte_flow *,
+		 struct rte_flow_error *);
+	/** See rte_flow_flush(). */
+	int (*flush)
+		(struct rte_eth_dev *,
+		 struct rte_flow_error *);
+	/** See rte_flow_query(). */
+	int (*query)
+		(struct rte_eth_dev *,
+		 struct rte_flow *,
+		 enum rte_flow_action_type,
+		 void *,
+		 struct rte_flow_error *);
+};
+
+/**
+ * Initialize generic flow error structure.
+ *
+ * This function also sets rte_errno to a given value.
+ *
+ * @param[out] error
+ *   Pointer to flow error structure (may be NULL).
+ * @param code
+ *   Related error code (rte_errno).
+ * @param type
+ *   Cause field and error types.
+ * @param cause
+ *   Object responsible for the error.
+ * @param message
+ *   Human-readable error message.
+ *
+ * @return
+ *   Pointer to flow error structure.
+ */
+static inline struct rte_flow_error *
+rte_flow_error_set(struct rte_flow_error *error,
+		   int code,
+		   enum rte_flow_error_type type,
+		   const void *cause,
+		   const char *message)
+{
+	if (error) {
+		*error = (struct rte_flow_error){
+			.type = type,
+			.cause = cause,
+			.message = message,
+		};
+	}
+	rte_errno = code;
+	return error;
+}
+
+/**
+ * Get generic flow operations structure from a port.
+ *
+ * @param port_id
+ *   Port identifier to query.
+ * @param[out] error
+ *   Pointer to flow error structure.
+ *
+ * @return
+ *   The flow operations structure associated with port_id, NULL in case of
+ *   error, in which case rte_errno is set and the error structure contains
+ *   additional details.
+ */
+const struct rte_flow_ops *
+rte_flow_ops_get(uint8_t port_id, struct rte_flow_error *error);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_FLOW_DRIVER_H_ */
-- 
2.1.4